Carl franks



Patented Deo. 16, ,1890.A

ROCK DRILL.

o. FRAME.

(No Model.)

I linkin. Aix/i014 MWI/waas.

we Noms persas co., num-umn., msumawmp. c.

UNITED STATES PATENT EETCE.

CARL FRANKE, OF EISLEBEN, PRUSSIA, GERMANY.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 442,731, dated December 16, 1890.

Application filed June l0, 1890. Serial No.354,987 (No model.) A

To all whom it may concern: l

Be it known that I, CARL FRANKE, a subject of the German Emperor, residing at N o. 30 Breiter lVeg, Eisleben, in the Kingdom of Prussia, Germany, have invented a certain new and useful Improvement in Rock-Drills, of which the following is a specification.

This invention relates to motors designed principally to be Operated by compressed air or other motive fluid to give a percussive and rotary movement to a drillingtool fitted thereon.

The improved motor is represented in the annexed drawings, in which- Figure l is a longitudinal section. Figs. 2, 2, 3, 4, 5,and 6 are cross-sections on linesA B, C D, E F, G H, and I K, respectively, of Fig. 1. Figs. 7, 8, and 9 are side elevations of certain parts removed from the motor.

ton sliding therein and having formed or fixed on it tliehollow piston-rod f. The piston fis made with an annular space surrounding it, and in said space slides an annular slide-valve l), having outside around its center an annular flange or projection tting accurately to the inside of the cylinder C', and inside an annular recess forming a way or passage for the exhaust.

a is the compressed-air inlet in the cylin der C.

c is a passage leading through the body of the piston f from near the one end of the annular space around said piston to the opposite end of the piston, and d is a similar passage from near the other end of the said an nular space to the other end of the piston opposite thereto.

ee are passages connect-ing the inner annular recess of the slide-valve b with the interior of the hollow piston-rod f', and f2 is an outlet from the interiorof said piston-rod f into the outer air.

The compressed air passes into the working-cylinder C through the port a, thence through the channel c behind the piston f, and pushes thelatter forward simultaneously with the slide-'valve l). The used airin front of the piston passes through the channel d underneath the slide-valve and through the channel e into the hollow piston-rod f from Where it escapes into the open air through C is the cylinder of the motor; f, the pis` the openingf2. As soon as during the forward motion of the piston f the ring gon the slide-valve b covers the port a the inlet of u compressed air is shut olf and the piston works now with expansion. /Vhen the ring g has passed the port a, the compressed air passes behind the ring g of the slide-valve, and as now a diminution of pressure has taken place in the meantime on the lefthand side of the ring by the expansion of the air the slide is thrown to the left and the action of the piston reversed. The back motion now takes place, the pressure-air surrounding the slide-valve arriving at the front of the piston through the channel d, while the previously-used-up air escapes through the channel c below the slide b to the channele and the hollow piston-rod. The slide l), as soon as it has passed the port o, is then thrown back again toward the right into the position illustrated.

Rotary motion is given to the piston by the following arrangement. lVithin the piston slides the arbor 1l with feather and groove h i', which arbor is turned slightly at each stroke and turns the piston with it. The r0- tat-ion of the arbor t' takes place as follows: At the back of the cylinder C is fastened a small cylinder 7e, preferably screwed into a continuation of the cylinder C. The cylinder 7e has two oppositely-located longitudinal slots l Z', terminating in the cross-slots m m at right angles thereto, Figs. 6 and 8. In the cylinder 7tis the hollow piston n, movable at a short stroke. Said piston has two oppositely-located oblique slots o o', and also two pins p p', which latter slide in the slots Z Z and prevent the hollow piston n from rotating during its to-a-nd-fro motion. On the arbor 't' is revolubly arranged a disk q,which gears by means of two pins r o" through the oblique 0 o of the hollow piston n and into the cross-slots m m of the cylinder 7s. Between the disk q and the disk s, revoluble likewise on the arbor fi, are journaled the pawls t t', which gear into the ratchet-wheel e, secured on the arbor t. The arbor t itself is journaled to revolve in the cylinder-lid by means of a band, and is kept in position by a nut When the hollow piston n is moved forward and backward, the disk q performs an oscillating motion by the pins e e of the IOO latterbeing forced alternately to the left and right by the action of the oblique slots o o and the cross-slots m m. This oscillating motion is given to the arbor t' and the piston f by means of t-he pawls t t and the ratchetwheel c, so that the piston can rotate only in one direction. The to-andfro motion of the hollow piston n is also operated by means of air-pressure. When the latter pushes the piston f forward, it drives also the hollow piston n backward, traveling through the channels y y', While the air located behind n escapes through the channel ,e and through the channel d underneath the slide l). lVhen, on the contrary, the pressure-air pushes the pis-ton f back, the former travels also through the channel e' and pushes the piston n forward.

I claiml. In a motor, the combination, with the cylinder C, having the lateral inlet-port a, of the piston f, with contrary passages c and d therein, and the ann ular slid e-valve h, adapted to slide on said piston andhaving the ring g thereon, for the purpose set forth, the hollow piston-rod f,with outlet f 2 and passages e e', the Whole substantially as illustrated and described.

2. In a motor, the combination, with the cylinder C land piston f, sliding therein, of a shaft 11, rotarily journaled in the cylinderhead and `tongued to said piston, a cylinder 7a, having slots m fm in the wall thereof, a piston n, movable longitudinally insaid cylinder k. and having inclined slots o 0 in the walls thereof, a disk q, having lugs fr r engaging in said slots m o m o', respectively, ratchet-wheel o on shaft i, and a pawl or-pawls on said disk q, adapted t0 rotate said ratchetwheel, for the purpose set forth.'

3. In a motor, the combination of the cylinder C, the piston f, sliding therein, the shaft z', rotarily journaled in one of the cylinderheads and tongued to said piston, passages y in said cylinder-head, the cylinder 7c, fitted into an extension of the cylinder C', a piston fn, sliding in said cylinder 7c and connected to rotate the shaft 7l, and a passage z in said cylinders C and 7c, the whole substantially as and for the purpose set forth.

In Witn ess whereof l have signed this specific-ation in presence of two witnesses.

CARL FRANKE.

Witnesses:

CARL BORNGRAEBER, BERNE, REINsDoRF. 

